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A custom map can't have it's own music. Unless it is connected to an object, you can learn how to do that here:
https://www.youtube.com/watch?v=0viVTiaECPc (https://www.youtube.com/watch?v=0viVTiaECPc)
However, if you want to change the Default FH music, then you can replace them with the files found in C:\\FeralHeart\\Media\\Music
Once you have found a tune or piece of music you would like to replace the default music with, be sure to name it to either one of these and then replace it with the other files in C:\\FeralHeart\\Media\\Music
(Played in Caves)
caves1
caves2
(Played in the Outdoors)
plains1
plains2
plains3
(Login Screen Music)
title
I hope this helps! Remember also that the file needs to be .mp3